20
KOLDWAVE 3AK (AIRMASTER)
TROUBLE SHOOTING GUIDE continued
PROBLEM
SYMPTOM
POSSIBLE CAUSE
REMEDY
Entire unit does not
operate.
Unit starts, but stops
immediately.
Unit operates, but
stops after a few
minutes.
Improper size of unit.
Insufficient air flow
through evaporator.
Evaporator discharge
air not cool.
1.
Power interruption. Green
power light should be off.
2.
Defective tank full unit cut-
out switch.
3.
Tank full unit cut-out switch
miswired.
4.
Condensate tank could be
full, but red light might be
defective.
1.
Defective compressor
thermal overload.
2.
Defective compressor motor.
3.
Defective run capacitor.
1.
Defective compressor motor.
2.
Defective thermal overload.
3.
Defective high pressure
switch.
4.
Loose connection in
electrical circuit.
5.
Manual reset button out on
HPC.
6.
Unit overcharged.
7.
Dirty condenser coil and
filter.
8.
Condensate tank right at trip
point.
9.
Condenser fan running at too
high an external static
pressure, reducing flow.
10. Cutting out on freeze control.
11. Defective freeze control.
12. Defective condenser fan
motor or fan motor capacitor.
1.
Improper size of unit.
1.
Dirty evaporator air filter in
unit.
2.
Dirty evaporator coil
3.
Ice on evaporator coil.
4.
Obstructed intake.
5.
Wrong speed on evaporator
fan motor.
6.
Evaporator fan motor
miswired.
1.
Refrigerant leak.
2.
Plugged cap. tubes or
strainer.
1.
Check external power supply.
2.
Check and replace.
3.
Review wiring diagram and
revise wiring.
4.
Check tank and replace red
light if defective.
1.
Replace after checking current.
2.
Remove and replace.
3.
Check and replace.
1.
Check and replace.
2.
Replace after checking current.
3.
Check cut-out setting and
replace if defective.
4.
Trace loose wire(s) and firm up
connection.
5.
After diagnosing and correcting
cause for unit trip out, begin
unit operation by depressing
the red button located inside
the lower hinged door.
6.
Purge some refrigerant.
7.
Clean filter and condenser coil.
8.
Empty tank.
9.
Reduce duct length.
10. Look for cause of low suction
line temperature.
11. Check and replace.
12. Check and replace.
1.
Check if the unit is undersized
for the load, Add supplemental
unit(s).
1.
Clean air filter.
2.
Unusual condition requires
cleaning.
3.
Defrost. Use fan only by
depressing the upper rocker
switch to right.
4.
Remove obstuction.
5.
Select higher speed on
3-speed fan selector switch.
6.
Consulting wiring diagram and
revise wiring.
1.
Locate leak and repair.
Evacuate and recharge.
2.
Replace cap. tube strainer
assembly.
Unit does not
operate.
Insufficient cooling.
